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BioAssay: AID 652062

HIV-1 Cell Fusion assay for clade B Env AD8 Measured in Cell-Based System Using Plate Reader - 7013-04_Inhibitor_Dose_CherryPick_Activity

This is a cell-cell fusion assay that mimics the process whereby HIV-1 enters cells. The assay employs HeLa effector cells, in which the clade B HIV-1 Env protein (HIV-1AD8) expression is driven by a promoter responsive to a tetracycline-controlled transactivator (tTA) protein. HIV-1AD8 is a different Env protein from clade B with 90% identity to HIV-1JRFL Env. The tTA protein is constitutively more ..
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Active(1066)
 
 
Inactive(325)
 
 
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 Tested Substances
All(1404)
 
 
Active(1068)
 
 
Inactive(326)
 
 
Inconclusive(10)
 
 
 Related BioAssays
 Related BioAssays
AID: 652062
Data Source: Broad Institute (7013-04_Inhibitor_Dose_CherryPick_Activity)
BioAssay Type: Confirmatory, Concentration-Response Relationship Observed
Depositor Category: NIH Molecular Libraries Probe Production Network
Deposit Date: 2013-02-26

Data Table ( Complete ):           View Active Data    View All Data
BioActive Compounds: 1066
Related Experiments
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AIDNameTypeComment
651609Broad Institute MLPCN HIV Entry Inhibitor Probe ProjectSummarydepositor-specified cross reference: Summary assay
651610HIV entry: Env-mediated Cell Fusion Measured in Cell-Based System Using Plate Reader - 7013-01_Inhibitor_SinglePoint_HTS_ActivityScreeningsame project related to Summary assay
652040Control Cell Fusion Counterscreen Assay Measured in Cell-Based System Using Plate Reader - 7013-02_Inhibitor_Dose_CherryPick_ActivityConfirmatorysame project related to Summary assay
652042CEM21 Cytotoxicity Assay Measured in Cell-Based System Using Plate Reader - 7013-03_Inhibitor_Dose_CherryPick_ActivityConfirmatorysame project related to Summary assay
652057HIV entry: Env-mediated Cell Fusion Measured in Cell-Based System Using Plate Reader - 7013-01_Inhibitor_Dose_CherryPick_ActivityConfirmatorysame project related to Summary assay
652058Cell fusion assay for clade C HIV-1ZM109 Env Measured in Cell-Based System Using Plate Reader - 7013-05_Inhibitor_Dose_CherryPick_ActivityConfirmatorysame project related to Summary assay
687021Control Cell Fusion Counterscreen Assay Measured in Cell-Based System Using Plate Reader - 7013-02_Inhibitor_Dose_DryPowder_ActivityConfirmatorysame project related to Summary assay
687023HIV entry: Env-mediated Cell Fusion Measured in Cell-Based System Using Plate Reader - 7013-01_Inhibitor_Dose_DryPowder_ActivityConfirmatorysame project related to Summary assay
687026CEM21 Cytotoxicity Assay Measured in Cell-Based System Using Plate Reader - 7013-03_Inhibitor_Dose_DryPowder_ActivityConfirmatorysame project related to Summary assay
Description:
Keywords: cell fusion, Env protein, HIV, luciferase, HIV Clade B, AD8


Assay Overview:
This is a cell-cell fusion assay that mimics the process whereby HIV-1 enters cells. The assay employs HeLa effector cells, in which the clade B HIV-1 Env protein (HIV-1AD8) expression is driven by a promoter responsive to a tetracycline-controlled transactivator (tTA) protein. HIV-1AD8 is a different Env protein from clade B with 90% identity to HIV-1JRFL Env. The tTA protein is constitutively expressed in the effector cells. The tTA protein is inactive in the presence of the tetracycline analogue Doxycycline (Dox) and activates HIV-1 Env expression in the absence of Dox. The CEM lymphoblast target cells express the HIV-1 receptors, CD4 and CCR5, and were stably transduced with a Firefly Luciferase (F-luc) gene under the control of the tTA-responsive promoter. During the co-cultivation of effector and target cells, HIV-1 Envs that are expressed on the effector cell surface bind receptor-bearing target cells and fuse the cell membranes. Cell cell fusion allows tTA to diffuse from the effector cells to the target cells and activate F-luc expression. F-luc activity is proportionate to the number of cell-cell fusion events and measured with the SteadyGlo (Promega) reagent.Detection of Luciferase will occur using the SteadyGlo reagent (Promega, Madison, WI). Maraviroc, a known CCR5 antagonist, that blocks Env-mediated cell fusion will be used as a positive control.

Expected Outcome: Compounds that inhibit cell fusion mediated by clade B HVI ENv AD8 will cause a decrease in Luciferase signal.
Protocol
HIV AD8 Fusion Assay Protocol

1.#Grow AD8 effector cells in DMEM passage medium with Doxycycline. Split 1:3 or 1:4 for passing. For HTS: 4 days prior to plating, thaw 3 vials (1.0 x 10;7 cells/ vial) into 4 triple flasks with 120 mL DMEM passage medium/flask. After 3 days, transfer to 3 Hyperflasks (HF) with ~550 mL RPMI induction media (~33 million cells per HF)

2.#Day 0: Pass AD8 cells to DoxFree. Wash cells 2x with PBS & add 15 ml Accutase per triple to detach cells. Stop Accutase by adding RPMI induction media. Spin down cells & seed 9-10 x10;6 cells in 120 ml of RPMI induction medium in triple flask.

3.#Day 1: Plating of AD8 cells. Wash cells with PBS & add 15 ml Accutase for triple or 50 ml for HF to detach cells (@ 37 degrees C). Stop by adding RPMI induction medium. Spin down the cells at 1200 rpm for 5 minutes & re-suspend in phenol red-free RPMI induction medium (with Puromycin).

4.#Count cells, adjust to 1.25 x10;5 cells/mL & seed 2,500 cells per well in 20 microl of RPMI (no Phenol Red) induction medium in Aurora white, opaque 384 well plates.

5.#Day 2: Pinning & adding CEM21 cells Spin down & count CEM21 cells. Adjust to 5.0x10;5 cells/ml in RPMI fusion medium. Dispense 5,000 cells at 10 microl/well in RPMI induction media. Pin transfer compounds to the plate. Positive control is Maraviroc to a final concentration of ~300 nM. Incubate the plate 37 degrees C O/N.

6.#Day 3: SteadyGlo & Read. Add 10 microl of room temperature Steady-Glo substrate. Wait 10 minutes & read luminescence with ultrasensitive settings on Perkin-Elmer EnVision with 0.5 second read time per well.


Media Recipes:

DMEM passage medium (1 L):
DMEM#####882 mL
Heat Inactivated-FBS###100 mL
Pen-Strep-L-Glu####10 mL
*Doxycycline (1 mg/mL)##2 mL
Puromycin (10 mg/mL)###100 microL
Geniticin (50 mg/mL)###4 mL


RPMI induction medium (DoxFree) (1 L):
RPMI (-Phenol red)###890 mL
10 % Tet approved HI-FBS##100 mL
Pen-Strep-L-Glu####10 mL
Puromycin (10 mg/mL)###100 microL


Notes
.#*Doxycycline is light sensitive so minimize light exposure
.#All cells have to be in exponential growth phase. AD8 & Hela-F-Luc cells are usually split 1:3 every 2-3 days, CEM#21 are split 1:10 every 3 days. Cells should not be allowed to overgrow in the flasks.
.#CEM21 cells take 1-2 weeks after thawing to grow at an optimal rate
.#Cells must be spun down after dissociation to remove StemPro Accutase from the medium.
.#Cells can be allowed to fuse 16 to 24 hours.
.#Effector (AD8) cells should be propagated for no more than 30 passages or 3 months whichever is sooner.
Comment
PRESENCE OF CONTROLS: Neutral control wells (NC; n=36) and positive control wells (PC; n=36) were included on every plate.

EXPECTED OUTCOME: Active compounds result in decreasing readout signal.
The compounds were assayed in multiple independent instances using an identical protocol; each instance is called a 'test'. For each test, the following analysis was applied:

ACTIVE CONCENTRATION LIMIT:
For each sample, the highest valid tested concentration (Max_Concentration) was determined and the active concentration limit (AC_limit) was set to equal (2)(Max_Concentration).

NORMALIZATION:
The raw signals of the plate wells were normalized using the 'Neutral Controls Minus Inhibitors' method in Genedata Assay Analyzer (v10.0.2):
The median raw signal of the intraplate neutral control wells was set to a normalized activity value of 0.
The median raw signal of the intraplate positive control wells was set to a normalized activity value of -100.
Experimental wells values were scaled to this range.

PATTERN CORRECTION: No plate pattern correction algorithm from Genedata Condoseo (v.10.0.2) was applied.

MEASUREMENT USED TO DETERMINE ACTIVE CONCENTRATION (AC): AC50
AC values were calculated using the curve fitting strategies in Genedata Screener Condoseo (7.0.3).
AC values were calculated up to the active concentration limit described for each sample.
pAC was set to equal -1*log10(AC)

PUBCHEM_ACTIVITY_OUTCOME:
Activity_Outcome = 1 (inactive) when:
a) compound shows activity but in a direction opposite to the expected outcome
in these cases, values describing curve fitting parameters (Sinf, S0, Hill Slope, log_AC50, log_AC50_SE) are set to null
b) curve fit is constant where activity is > -30% and < 30% at all tested concentrations, or
c) AC > AC_limit
Activity_Outcome = 2 (active) when:
AC <= AC_limit
Activity_Outcome = 3 (inconclusive) when:
a) Curve fitting strategy resulted in a constant fit with activity >= -70% but <= -30%, or
b) The fit was deemed not valid due to poor fit quality.

PUBCHEM_ACTIVITY_SCORE:
If PUBCHEM_ACTIVITY_OUTCOME = 1 (inactive) or 3 (inconclusive),
then PUBCHEM_ACTIVITY_SCORE = 0
If PUBCHEM_ACTIVITY_OUTCOME = 2 (active)
then PUBCHEM_ACTIVITY_SCORE = (10)(pAC)
Scores relate to AC in this manner:
120 = 1 pM
90 = 1 nM
60 = 1 uM
30 = 1 mM
0 = 1 M
When the active concentration (AC) is calculated to be greater than the highest valid tested concentration (Max_Concentration), the PUBCHEM_ACTIVITY_SCORE is calculated using Max_Concentration as the basis.
When the active concentration (AC) is calculated to be less than the lowest tested concentration, the PUBCHEM_ACTIVITY_SCORE is calculated using the lowest tested concentration as the basis.

DATA AGGREGATION:
Once the data for each test was processed, the test number was appended to all column headers in that test's data set. The individual test results were then aggregated as follows:

1. The final PUBCHEM_ACTIVITY_OUTCOME was set to:
a. '2' (active) when all test outcomes were '2' (active), or
b. '1' (inactive) when all test outcomes were '1' (inactive), or
c. '3' (inconclusive) when the test outcomes were mixed.

2. The final ACTIVE_CONCENTRATION (AC) was set as follows:
a. If the final PUBCHEM_ACTIVITY_OUTCOME = 2, AC was set as the mean of the constituent test active concentrations;
b. If the final PUBCHEM_ACTIVITY_OUTCOME = 1 or 3, AC was left empty.

3. The final PUBCHEM_ACTIVITY_SCORE was calculated based on the aggregated ACTIVE_CONCENTRATION, using the same logic described above for individual test scores.

Note:
The individual dose data point columns ('Activity_at_xxuM') reported here represent the median of valid (unmasked) replicate observations at each concentration. These values are the inputs to a curve fitting algorithm.
All other data columns represent values which are derived during the curve fitting algorithm; this may sometimes include automatic further masking of some replicate data points.
Occasionally this results in perceived inconsistencies: for example, between the derived 'Maximal_Activity' and the apparent most active data point.
Categorized Comment - additional comments and annotations
From PubChem:
Assay Format: Cell-based
Assay Cell Type: HeLa
From ChEMBL:
Assay Type: Functional
Result Definitions
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TIDNameDescriptionHistogramTypeUnit
OutcomeThe BioAssay activity outcomeOutcome
ScoreThe BioAssay activity ranking scoreInteger
1AC50_Qualifier'>','=', or '<'String
2AC50_uM*The concentration at which activity reaches 50% of the maximumFloatμM
3pAC50_MEqual to -1*log10(AC50)String
4ACTIVITY_OUTCOME_TEST1The PubChem Activity Outcome for the subset of data included in the indicated Test number.Integer
5ACTIVITY_SCORE_TEST1The PubChem Activity Score for the subset of data included in the indicated Test number.Integer
6ASSAYDATA_COMMENT_TEST1Comments relevant to the subset of data included in the indicated Test number.String
7AC50_Qualifier_TEST1'>','=', or '<'String
8AC50_uM_TEST1The concentration at which activity reaches 50% of the maximumFloatμM
9pAC50_M_TEST1Equal to -1*log10(AC50)String
10Hill_Slope_TEST1The slope at AC50Float
11S0_(%)_TEST1The fitted activity value at zero concentrationFloat%
12Sinf_(%)_TEST1The fitted activity value at infinite concentrationFloat%
13Num_Points_TEST1The number of data points used to generate the plotInteger
14Max_Activity_(%)_TEST1The maximum activity value observed, based on mean of replicates per concentrationFloat%
15Max_Activity_Conc_uM_TEST1The concentration at which the maximum activity is observedFloatμM
16Max_Concentration_uM_TEST1Maximum valid test concentrationFloatμM
17Activity_at_0.235uM_(%)_TEST1 (0.235μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
18Activity_at_0.26uM_(%)_TEST1 (0.26μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
19Activity_at_0.285uM_(%)_TEST1 (0.285μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
20Activity_at_0.35uM_(%)_TEST1 (0.35μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
21Activity_at_0.46uM_(%)_TEST1 (0.46μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
22Activity_at_0.5uM_(%)_TEST1 (0.5μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
23Activity_at_0.56uM_(%)_TEST1 (0.56μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
24Activity_at_0.9uM_(%)_TEST1 (0.9μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
25Activity_at_1uM_(%)_TEST1 (1μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
26Activity_at_1.1uM_(%)_TEST1 (1.1μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
27Activity_at_1.95uM_(%)_TEST1 (1.95μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
28Activity_at_2.1uM_(%)_TEST1 (2.1μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
29Activity_at_3.8uM_(%)_TEST1 (3.8μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
30Activity_at_4.2uM_(%)_TEST1 (4.2μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
31Activity_at_4.6uM_(%)_TEST1 (4.6μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
32Activity_at_7.5uM_(%)_TEST1 (7.5μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
33Activity_at_8uM_(%)_TEST1 (8μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
34Activity_at_9uM_(%)_TEST1 (9μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
35Activity_at_15uM_(%)_TEST1 (15μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
36Activity_at_16uM_(%)_TEST1 (16μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
37Activity_at_18uM_(%)_TEST1 (18μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
38Activity_at_30uM_(%)_TEST1 (30μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
39Activity_at_35uM_(%)_TEST1 (35μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
40ACTIVITY_OUTCOME_TEST2The PubChem Activity Outcome for the subset of data included in the indicated Test number.Integer
41ACTIVITY_SCORE_TEST2The PubChem Activity Score for the subset of data included in the indicated Test number.Integer
42ASSAYDATA_COMMENT_TEST2Comments relevant to the subset of data included in the indicated Test number.String
43AC50_Qualifier_TEST2'>','=', or '<'String
44AC50_uM_TEST2The concentration at which activity reaches 50% of the maximumFloatμM
45pAC50_M_TEST2Equal to -1*log10(AC50)String
46Hill_Slope_TEST2The slope at AC50Float
47S0_(%)_TEST2The fitted activity value at zero concentrationFloat%
48Sinf_(%)_TEST2The fitted activity value at infinite concentrationFloat%
49Num_Points_TEST2The number of data points used to generate the plotInteger
50Max_Activity_(%)_TEST2The maximum activity value observed, based on mean of replicates per concentrationFloat%
51Max_Activity_Conc_uM_TEST2The concentration at which the maximum activity is observedFloatμM
52Max_Concentration_uM_TEST2Maximum valid test concentrationFloatμM
53Activity_at_0.26uM_(%)_TEST2 (0.26μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
54Activity_at_0.5uM_(%)_TEST2 (0.5μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
55Activity_at_1uM_(%)_TEST2 (1μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
56Activity_at_2.1uM_(%)_TEST2 (2.1μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
57Activity_at_4.2uM_(%)_TEST2 (4.2μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
58Activity_at_8uM_(%)_TEST2 (8μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
59Activity_at_15uM_(%)_TEST2 (15μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
60Activity_at_16uM_(%)_TEST2 (16μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%
61Activity_at_35uM_(%)_TEST2 (35μM**)The average measured activity of all accepted replicates at the specified concentrationFloat%

* Activity Concentration. ** Test Concentration.
Additional Information
Grant Number: 1 R03 DA034601-01

Data Table (Concise)
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